More often than not, when something hits the fan at a Pop Warner level game, rergardless whose area that something belongs in, we wind up with a larger share of clean up than we may deserve. There are times things simply require that someone act like "the adult" and motivate those in charge to step up to their responsibilities. If doing so prevents something from hitting that fan, we are all that much better off.
In general, spectators are absolutely not our responsibility and should be totally ignored whenever possible, UNLESS what they might be doing seriously threatens what we are trying to do. If it becomes necessary that either a certain behavior stop, or the game itself stop, we have control of the game. The slightest suggestion that whatever might be going on could cause the game to be interruped, or even ended, is usually sufficient to motivate game management to rise to the occassion and take the appropriate action to eliminate the threat.
Involvement can easily boil down to a choice of a little involvement early, or a lot of heartache later on.
